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Retirement Plans
 9 Months Ended
Jan. 31, 2022
Retirement Plans [Abstract]  
Retirement Plans
Note 14 — Retirement Plans

The components of net pension income for our defined benefit plans were as follows:

  
Three Months Ended
January 31,
    
Nine Months Ended
January 31,
  
   
2022
    
2021
    
2022
    
2021
  
Service cost
  
$
291
    
$
356
    
$
898
    
$
1,036
  
Interest cost
    
5,122
      
4,564
      
15,523
      
13,695
  
Expected return on plan assets
    
(9,986
)
    
(9,853
)
    
(30,387
)
    
(28,880
)
Amortization of prior service cost
    
(23
)
    
(23
)
    
(67
)
    
(72
)
Amortization of net actuarial loss
    
1,858
      
1,944
      
5,632
      
5,964
  
Net pension income
  
$
(2,738
)
  
$
(3,012
)
  
$
(8,401
)
  
$
(8,257
)

The service cost component of net pension income is reflected in Operating and administrative expenses on our Unaudited Condensed Consolidated Statements of Net Income. The other components of net pension income are reported separately from the service cost component and below Operating income. Such amounts are reflected in Other income, net on our Unaudited Condensed Consolidated Statements of Net Income.

Employer defined benefit pension plan contributions were $3.4 million and $11.9 million for the three and nine months ended January 31, 2022, respectively, and $3.6 million and $12.5 million for the three and nine months ended January 31, 2021, respectively.

Defined Contribution Savings Plans

The expense for employer defined contribution savings plans was $7.2 million and $22.8 million for the three and nine months ended January 31, 2022, respectively, and $5.6 million and $17.4 million for the three and nine months ended January 31, 2021, respectively.